package com.hou.houlymall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.hou.common.to.es.SkuEsModel;
import com.hou.common.utils.R;
import com.hou.houlymall.search.config.HoulymallElasticSearchConfig;
import com.hou.houlymall.search.constant.EsConstant;
import com.hou.houlymall.search.feign.ProductFeignService;
import com.hou.houlymall.search.service.MallSearchService;
import com.hou.houlymall.search.vo.AttrResponseVo;
import com.hou.houlymall.search.vo.BrandVo;
import com.hou.houlymall.search.vo.SearchParam;
import com.hou.houlymall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;


import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author H
 * @create 2021-08-10 10:44
 */
@Service("mallSearchService")
public class MallSearchServiceImpl implements MallSearchService {


    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    /**
     * 根据传递来的页面的查询参数，去es中检索商品
     *
     * @param param 检索的所有参数
     * @return 返回检索的结果，里面包含页面需要的所有信息
     */
    @Override
    public SearchResult search(SearchParam param) {
        //1、动态构建出查询需要的DSL语句
        SearchResult result = null;

        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);


        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, HoulymallElasticSearchConfig.COMMON_OPTIONS);

            //3、分析响应数据封装我们需要的格式
            result = buildSearchResult(response, param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }


    /**
     * 准备检索请求
     * #模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //构建DSL语句
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        // 查询：模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）

        //1、构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、must-模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2、bool - filter - 按照3级分类id查询
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2、bool - filter - 按照品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        //1.2、bool - filter - 按照所有指定的属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String attrStr : param.getAttrs()) {
                //attrs=1_5:8寸&attrs=2_16G:8G
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                //attrs=1_5:8寸
                String[] s = attrStr.split("_");
                //检索的属性id
                String attrId = s[0];
                //这个属性的检索用的值
                String[] attrValues = s[1].split(":");
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        //1.2、bool - filter - 按照库存是否有进行查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.2、bool - filter - 按照价格区间
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            //1_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2) {
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1、排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = "asc".equalsIgnoreCase(s[1]) ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }

        //2.2、分页    pageSize:5
        // pageNum:1 from:0 size:5 [0,1,2,3,4]
        // pageNum:2 from:5 size:5
        // from = (pageNum-1)*size
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3、高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /*
         * 聚合分析
         */
        //1、品牌聚合 brandAgg
        TermsAggregationBuilder brandAgg = AggregationBuilders.terms("brandAgg");
        brandAgg.field("brandId").size(50);
        //品牌聚合的子聚合
        brandAgg.subAggregation(AggregationBuilders.terms("brandNameAgg").field("brandName").size(1));
        brandAgg.subAggregation(AggregationBuilders.terms("brandImgAgg").field("brandImg").size(1));
        //TODO 1、聚合brand
        sourceBuilder.aggregation(brandAgg);

        //2、分类聚合 catalogAgg
        TermsAggregationBuilder catalogAgg = AggregationBuilders.terms("catalogAgg").field("catalogId").size(20);
        catalogAgg.subAggregation(AggregationBuilders.terms("catalogNameAgg").field("catalogName").size(1));
        //TODO 2、聚合catalog
        sourceBuilder.aggregation(catalogAgg);

        //3、属性聚合 attrAgg
        NestedAggregationBuilder attrAgg = AggregationBuilders.nested("attrs", "attrs");
        //聚合出当前所有的attrIdAgg
        TermsAggregationBuilder attrIdAgg = AggregationBuilders.terms("attrIdAgg").field("attrs.attrId");
        //聚合分析出当前attrId对应的名字
        attrIdAgg.subAggregation(AggregationBuilders.terms("attrNameAgg").field("attrs.attrName").size(1));
        //聚合分析出当前attrId对应的所有可能的属性值attrValue
        attrIdAgg.subAggregation(AggregationBuilders.terms("attrValueAgg").field("attrs.attrValue").size(50));
        attrAgg.subAggregation(attrIdAgg);
        //TODO 3、聚合attr
        sourceBuilder.aggregation(attrAgg);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }

    /**
     * 构建结果数据
     *
     * @param response ...
     * @return ...
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                //如果有Keyword检索条件，就要设置高亮
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        //2、当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attrs = response.getAggregations().get("attrs");
        ParsedLongTerms attrIdAgg = attrs.getAggregations().get("attrIdAgg");
        for (Terms.Bucket bucket : attrIdAgg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            //2、得到属性的名字
            String attrName =
                    ((ParsedStringTerms) bucket.getAggregations().get("attrNameAgg")).getBuckets().get(0).getKeyAsString();
            //3、得到属性的值
            List<String> attrValue =
                    ((ParsedStringTerms) bucket.getAggregations().get("attrValueAgg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValue);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        //3、当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brandAgg = response.getAggregations().get("brandAgg");
        for (Terms.Bucket bucket : brandAgg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //2、得到品牌的名字
            String brandName =
                    ((ParsedStringTerms) bucket.getAggregations().get("brandNameAgg")).getBuckets().get(0).getKeyAsString();
            //3、得到品牌的图片
            String brandImg =
                    ((ParsedStringTerms) bucket.getAggregations().get("brandImgAgg")).getBuckets().get(0).getKeyAsString();

            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4、当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalogAgg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalogAgg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalogNameAgg");
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //5、分页信息-页码
        result.setPageNum(param.getPageNum());
        //5、分页信息-总记录树
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //5、分页信息-总页码-计算
        int totalPages = (int) total % EsConstant.PRODUCT_PAGESIZE == 0 ?
                (int) total / EsConstant.PRODUCT_PAGESIZE :
                (int) (total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(totalPages);

        ArrayList<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6、构建面包屑导航功能
        if (param.getAttrs()!=null && param.getAttrs().size()>0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //1、分析每一个attrs传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //attrs=2_5存:6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {});
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }
                //2、取消了这个面包屑以后，我们要跳转到哪个地方，将请求地址的url里面的当前置空
                //拿到所有的查询条件，去掉当前
                //attrs=  15_海思
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://search.houlymall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }

        //品牌，分类
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if (r.getCode() == 0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName()+";");
                    replace = replaceQueryString(param, brandVo.getBrandId() + "", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.houlymall.com/list.html?" + replace);
            }

            navs.add(navVo);
        }
        //TODO 分类：不需要导航取消

        return result;
    }

    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            //浏览器对空格的编码和java不一样
            encode = encode.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.getQueryString().replace("&" + key + "=" + encode, "");
    }
}
